Carburetor



May l2, 1931i H. w. POTTER 1,804,842

CARBURETOR Filed sept. 17 41928 INVENTOR.

A TTORNE Patented May 12, 1931 UNITE srrss PATENT OFFICE j HARRY W. POTTER, OF BIRMINGHAM, MICHIGAN CARBURETOR Appncation med september 17, 192s. serian No. 306.383.

Figure 2 is a section on line 2-2 of Figure 1, with a part broken away. o

In the drawings the carburetor is shown as consisting ofy a float bowl having therein the usual float 11 controlling the inflow of liquid fuel thereto.

This float bowl is surmounted by a mixing chamber shown as constructed of two parts, 12 and 13, of which the upper part 12 is provided with a flanged extension 14 with the yflange located at 15l whereby the carburetor is secured to the intake manifold of an engine. The two parts 12 and 13 will be secured together in any suitable fashion as by the so screws 16 passing through suitable lugs 17.

The mixing chamber is likewise provided with a main air inlet valve, not shown in detail, but indicated by a boss 18. The air in let valve is provided with a stem 19 through which its lmovement may be controlled by a lever20.

The construction, so far described, is c0nventionaland forms no part ofthe present invention.

Leading from the float bowl 1() is a passage 25 controlled by an adjustable needle Vvalve 26. This passage opens at its upper end through a small nipple 27 into a Venturi tube 28, the upper end of which is just below the `passage, in the extension 14.

Primary air is admitted through a small annular passage 29 to mix with the fuel coming from nipple 27 and passes up into the Venturi tube, while additional air is admitted from the mixing chamber to the lower part of the Venturi tube through slots 36, formed therein as described below.

The construction of the Venturi tubeV 28 and the parts immediately adjacent thereto, form the present invention. 55

Heretofore, it has been customary to form the Venturi tube as an integral part of the portion 13 of the mixing chamber with a cylindrical extension as mounted thereon in order to bring the upperfedge to the proper 6U height. yThis. renders the formation of the `air passages at the base of the venturi of great difficulty, 'requiring them to be drilled through the use of diliicult drilling operations. In the present construction, the lower part of the venturi indicated at 35 is formed integral with the part 13 and this is then slotted as at 36 down tonear. the upper end of the nipple 27.l The part 35 is formed with a 70 shoulder 37 thereona-nd is cylindrical on its outer surface. The slots 36 are cut not only lin the cylindrical portion but in the shoulder 37.

After the slots'have been formed, a funnel 75 shaped ring of sheet metal with its lower portion cylindrical and its upper portion flared is slipped over the part 35 to rest on shoulder 37. This ring is indicated at 38 and is of such shape as to form a continuation of the venturi constructed in part by the part 35.

The carburetor made in the present fashion operates substantially the same as the conventional carburetor of the same type but is legasiier and more elliciently made and assem- Now having described the invention and the preferred form of embodiment, it is to be understood that the said invention is to be pan and integral with the wall thereof and having slots n its side Wall running to the upper edge for providing communication between the interior of said boss and the interor of the pan, and a thin Walled, flared, open ended tube mounted on said boss and forming an extension thereof, said tube being so mounted on said boss as to expose a portion of eaohof said slots and to close the remaining portion of each slot.

HARRY W. POTTER. 

